shear strength direct shear vane triaxial tests compaction maximum dry density optimum moisture content - Question Bank
1. The primary goal of performing a direct shear test at different normal loads is to:
2. In the context of compaction, 'saturation line' or 'zero air voids' line represents the condition where:
3. Which type of triaxial test provides parameters for both total stress and effective stress analysis?
4. If the OMC of a soil is 15% and its MDD is 1800 kg/m³, what is the dry density of the soil at a moisture content of 12% if it is compacted with the same energy?
5. For a cohesionless soil (c=0), the shear strength is solely dependent on:
6. The relationship between shear strength (τ), normal stress (σ), cohesion (c), and angle of internal friction (φ) is described by the:
7. Which parameter is NOT directly measured during a standard compaction test?
8. The vane shear test is most suitable for:
9. The deviator stress in a triaxial test is defined as:
10. In a triaxial test, the minor principal stress is denoted by:
11. In a triaxial test, the major principal stress is denoted by:
12. The compaction test is important for construction because it helps ensure:
13. The shear strength of a saturated clay under undrained conditions is primarily dependent on:
14. The shear strength of a granular soil (like sand) under drained conditions is primarily dependent on:
15. The 'quick' test in triaxial compression refers to:
16. In a direct shear test, the shear force at failure is applied:
17. Which of the following factors affects the shear strength of a soil?
18. The 'zero air voids' curve on a compaction plot represents the theoretical maximum dry density achievable at different moisture contents if:
19. If a soil is compacted wet of optimum, its:
20. If a soil is compacted dry of optimum, its:
21. A compaction curve plots dry density against moisture content. The peak of this curve represents:
22. The shear strength of a saturated clay under drained conditions is represented by:
23. The shear strength of a saturated clay under undrained conditions is often represented by:
24. Which test is most appropriate for determining the undrained shear strength of a saturated clay in a laboratory, especially when dealing with sensitive clays?
25. In the Mohr-Coulomb equation (τ = c + σ tan φ), 'φ' represents:
26. In the Mohr-Coulomb equation (τ = c + σ tan φ), 'c' represents:
27. The Mohr-Coulomb failure criterion is often used to represent the shear strength of soils. It is expressed as:
28. In a direct shear test, if the normal stress is increased, the shear strength of the soil:
29. The shear strength of a compacted soil is generally:
30. Which of the following statements is true regarding the relationship between compaction energy and OMC/MDD?
31. For a given soil, as the compaction effort increases (e.g., from Standard to Modified Proctor), the MDD generally:
32. For a given soil, as the compaction effort increases (e.g., from Standard to Modified Proctor), the OMC generally:
33. Optimum moisture content (OMC) is the moisture content at which a soil achieves its:
34. Maximum dry density (MDD) is the highest dry unit weight achievable for a soil at:
35. The Modified Proctor Compaction test uses a higher compaction energy than the Standard Proctor test. This is achieved by:
36. In the Standard Proctor Compaction test, the rammer weighs approximately:
37. The Standard Proctor Compaction test uses a specific amount of energy applied by dropping a rammer from a specific height a specific number of times. What is the drop height of the rammer?
38. Which compaction test is commonly used in laboratories to determine the relationship between moisture content and dry density for a soil?
39. The primary purpose of soil compaction is to:
40. Compaction of soil is a process of:
41. The Consolidated-Undrained (CU) triaxial test allows for the determination of shear strength parameters based on:
42. The Unconsolidated-Undrained (UU) triaxial test is used to determine the shear strength of a soil under:
43. Which type of triaxial test is performed at a slow strain rate to allow for pore water pressure dissipation and drainage?
44. In a triaxial compression test, the confining pressure is applied by:
45. What is the primary advantage of the vane shear test for soft clays?
46. The vane shear test is particularly useful for determining the undrained shear strength of:
47. In a direct shear test, the shear stress at failure is calculated as:
48. The direct shear test is most suitable for determining the shear strength of which type of soil?
49. Which of the following tests is primarily used to determine the shear strength parameters (cohesion and angle of internal friction) of a soil sample in a relatively undisturbed or remolded state?